In March 2020, while serving as Fine Gael's Minister for Finance, Paschal Donohoe reviewed Thomas Piketty's second major book, Capital and Ideology, in The Irish Times. He summarised the central proposal accurately. Piketty's progressive triptych of three taxes: on annual income, on annual wealth and on inheritance, with marginal rates that Donohoe quoted in the review as beginning at 60-70% on incomes and wealth ten times greater than the average and rising to 80-90% on those one hundred times the average. Donohoe described the design fairly. He acknowledged the empirical density of the underlying work. He concluded the review with these two sentences. In our era, this is now among the most vital of tasks. On that test, Piketty triumphs.

This is the artefact the rest of this piece is built around. The Minister who wrote it retained his cabinet position for the subsequent five years, delivered the Budget 2026 statement in October 2025, and resigned in November 2025 to take up the role of managing director and chief knowledge officer at the World Bank. Throughout that period, he chose, in successive budgets, the policy direction the argument identifies as the losing side of the test. The Irish political class does not oppose Piketty because it does not know him. It opposes him because it knows him and has chosen.

The question this piece sets out to answer is what the test actually is. The long arc Piketty documents, where Ireland sits on it, what the framework he built with co-authors predicts and what is now visibly happening in Irish political behaviour that suggests the prediction is arriving.

What the long arc actually shows

Piketty's central work is Capital in the Twenty-First Century, published in French in 2013 and in English in 2014. It is not a polemic. It is the published output of fifteen years of empirical work, conducted with Tony Atkinson and Emmanuel Saez and a wider network of collaborators, building consistent long-run time series of income and wealth concentration across major economies. The data covers Britain and France from the early eighteenth century, Germany and the United States from later but with comparable depth, and shorter series for a long list of additional countries. The infrastructure built to produce these series is now the World Inequality Database, hosted at the Paris School of Economics, which Piketty co-founded.

The empirical finding is a U-curve. Across all the major Western economies the data covers, private wealth, valued in current market terms, ran at roughly six to seven times national income for two centuries through the Belle Époque, peaking around 1900 to 1910. It collapsed to two to three times national income by 1950, through the combined effects of two world wars, the resulting inflation and the confiscatory tax regimes the post-war social-democratic consensus adopted. It rebuilt steadily from the 1950s and reached four to six times national income across the rich-country sample by 2010. The projection forward, given current growth rates and savings rates, is a return to roughly seven times national income by 2100. Belle Époque levels. The wealth-to-income ratio, which is the cleanest single measure of how much accumulated capital exists relative to the size of the economy producing the current year's flows, is on course to return to its pre-1914 peak.

The mechanism Piketty offers for this is the formula now most associated with his name. The rate of return on capital, denoted r, has historically averaged around four to five percent over very long periods across diverse economies. The rate of economic growth, denoted g, has only rarely exceeded one and a half percent outside the unusual decades immediately after the Second World War. When r persistently exceeds g, capital's share of national income rises and wealth concentrates, because the return on existing wealth grows faster than the economy as a whole. The mechanism is not deterministic. r > g amplifies whatever inequality of capital ownership already exists. It is also not the whole story, as Piketty himself has clarified in subsequent academic responses to critics. It is the long-run dynamic that underwrites the U-curve.

What changes the story is not the formula. The formula is mostly true at long enough time horizons. What changes the story is whether a society chooses, through tax design and political action, to push back against the dynamic, or whether it lets the dynamic run.

For most of the twentieth century, Western democracies chose to push back. Marginal income tax rates above 70%, sometimes above 90%, on the highest brackets in the United States and the United Kingdom. Inheritance taxes that effectively prevented the unbroken intergenerational transmission of very large estates. Annual wealth taxes in a long list of European countries, most of which were administered poorly and abolished from the 1980s onward. The dynamic was real. The political choice was to suppress it.

From the late 1970s onward, the political choice reversed. Top marginal income tax rates were cut in country after country. Annual wealth taxes were abolished or hollowed out. Inheritance taxes were progressively diluted. The U-curve resumed its upward arc. This is the empirical observation Piketty's work documents. It is not contested in serious economics. The disagreement begins, and ends, with what should be done about it.

Where Ireland sits on the arc

The Irish series in the World Inequality Database was constructed primarily by Brian Nolan, then at University College Dublin and now at Oxford. The earliest version is the chapter Nolan contributed to the Atkinson-Piketty 2007 collection on top incomes across the twentieth century. The series has been updated since.

The headline pattern for Ireland tracks the broader English-speaking pattern but with an Irish-specific shape. The top one percent income share fell from around twelve percent of all personal income before the Second World War to under six percent in the late 1970s. From the early 1980s the share rose, reaching the high single digits by 1990 and continuing to climb through the boom decades. The post-2008 reversal pulled the share back somewhat. Current tax-records-based estimates place the share around eight to ten percent depending on the year and the precise definition. The Central Statistics Office's Survey of Income and Living Conditions has historically reported lower numbers, around six to seven percent, which the Economic and Social Research Institute and the Nevin Economic Research Institute have shown is largely an artefact of survey under-coverage of high-income households.

The wealth side is more incomplete and more striking. The Central Statistics Office's Household Finance and Consumption Survey, conducted as part of the Eurosystem's coordinated household-wealth project, published its 2023 wave on 11 June 2025. The headline figures: the top ten percent of households hold fifty percent of all net wealth in the Republic. The top one percent hold around thirteen percent. The threshold to be in the top decile is just over one million euros.

The CSO is unusually candid about the limits of these figures. Its release page for the 2023 wave states explicitly that the survey does not capture a significant portion of household wealth in the upper percentiles, that the very wealthiest households were not randomly selected in the sample and that their wealth is therefore not included in the estimates. The thirteen percent figure for the top one percent is, in other words, a floor. The true figure is materially higher. This is a known issue across all eurozone household-wealth surveys of this kind. It systematically understates top concentration.

A separate measure: the Sunday Times Rich List, which covers the wealthiest individuals in Britain and Ireland. The British series is the longer one and is therefore more useful for trajectory work. In 1989, the wealth held by the top two hundred families in the United Kingdom amounted to roughly five percent of British gross domestic product. By 2025, the same group held wealth equivalent to twenty-five percent of British GDP. A fivefold rise over a single working life. Ireland does not have a comparable continuous rich-list series of the same length, but the Forbes-based count places the Republic at eleven dollar-billionaires at the end of 2025, with combined wealth of forty-six point three billion euros, according to the Oxfam Ireland summary published in January 2026. The Irish Times calculation, also in January 2026, was that those eleven individuals are collectively wealthier than approximately eighty-five percent of adults in the State.

These are not abstractions. The political character of wealth held at this concentration is structural. Wealth is power, especially in a country small enough that a handful of fortunes are large relative to entire policy domains. Wealth at this scale buys media. It funds the legal and lobbying infrastructure that shapes how regulation is written and enforced. It funds the think-tank ecosystem that pre-decides what is considered serious policy and what is dismissed as fringe. It pays for the network of intermediaries who do the work of converting wealth into influence into more wealth. The middle-class twenty-year-old paying twelve hundred euros a month for a room in a shared house in Dublin is not just paying a high rent. They are, through the structure of rents, transferring a fraction of their wage to someone whose own income is the appreciation of accumulated assets and is largely untaxed. This is the r > g dynamic at household-level operation.

Brahmin Left, Merchant Right, and Ireland as named exception

Piketty's second major book, Capital and Ideology, published in French in 2019 and in English in 2020, broadened the empirical project from the economic history of wealth concentration to the political-history question of how voters relate to the wealth distribution. With Amory Gethin and Clara Martínez-Toledano he built a parallel data project, the World Political Cleavages and Inequality Database, covering three hundred-plus elections across twenty-one Western democracies between 1948 and 2020. The methodological backbone is the use of post-electoral surveys with consistent variables across countries and time, allowing the political-economic alignment of voters to be tracked across the long post-war period.

The central finding was published as the working paper Brahmin Left vs Merchant Right in 2018 and as the full Quarterly Journal of Economics paper in 2022. In the 1950s and 1960s, across the countries the data covers, left-wing parties were primarily supported by lower-education and lower-income voters. Right-wing parties by higher-education and higher-income voters. Over the subsequent decades, this configuration unwound. By the 2000s and 2010s, the high-education vote had moved decisively to the left, while the high-income and high-wealth vote stayed on the right. Both elite groups had their own party. Both elite groups voted in their own structural interest. The two-elite political configuration removed redistributive economic conflict as the primary axis of party competition, replacing it with sociocultural conflict between an educated-progressive elite and a propertied-conservative elite, with the lower-education, lower-income voter electorally available to whichever party most credibly addressed their non-economic grievances.

This is what Piketty and his co-authors call the multiple-elite party system. Brahmin Left because the left party becomes the party of the credentialled professional class. Merchant Right because the right party remains the party of capital owners. Both elites can vote their own interests without disturbing redistribution, because neither party offers a credible redistributive programme. The post-war social-democratic settlement is, under this framework, structurally over.

The paper's relevant finding for this piece is that Ireland is one of two named exceptions in the dataset. Ireland and Portugal are explicitly flagged as countries where the educational realignment had not happened within the paper's data window. The authors offer a reading: both are countries where late industrialisation, strong Catholic-conservative legacies and the persistence of class-based left-wing parties kept the older alignment in place longer than elsewhere. The paper does not predict that the exception will persist indefinitely. It identifies it.

In the data, Ireland was an exception. In the years since the data window closes, the question becomes whether the realignment is now arriving.

The Dublin Central by-election, held on Saturday 23 May 2026 with the count completed on Sunday 24 May, is the kind of data point the framework asks us to read with care. The Social Democrats' Daniel Ennis was elected on the ninth count with twelve thousand and fifty final-count votes. Sinn Féin's Janice Boylan came second on seven thousand seven hundred and eighty-seven votes, in the home constituency of party leader Mary Lou McDonald. Fianna Fáil's result was reported as possibly its worst ever by-election performance. Two anti-establishment independent candidates, Gerry Hutch and Malachy Steenson, both grew their first-preference shares from the 2024 general election baseline. Hutch went from 9.46% to 11.7%, Steenson from 4.89% to 9.5%, a near-doubling in the second case. Steenson's campaign was explicitly anti-immigration. Mary Lou McDonald responded to the result not by conceding but by defending her leadership, telling reporters her position was a settled matter and that there was only one way to become leader of Sinn Féin, at the party's annual ardfheis. The Irish Times' political analysis published the following day described Sinn Féin as caught between an anti-establishment right and a soft left, with both forces strengthening, and McDonald as having no clear answer to the squeeze.

What the framework predicts for a country in which the realignment is arriving late is approximately this. The educated-redistributive vote consolidates into a soft-left party with a clear distributional offer. The propertied right holds with the dominant parties of capital. The lower-education, working-class, distributional-grievance vote splits between left-progressive options and anti-establishment-identitarian options. The previous redistributive vehicle, in this case Sinn Féin, is torn between the two flanks. The party's previous coherence rested on holding a working-class nationalist base together with a redistributive economic programme. The realignment shears this coalition: one half goes to the soft-left party with the credible economic programme, the other half goes to the social-nativist option with the credible identitarian programme. The party in the middle loses on both sides.

It is too early to call this complete. One by-election in McDonald's home constituency, however structurally suggestive, is not yet a re-alignment in the sense the political-economy literature uses the term. The Piketty-Gethin-Martínez-Toledano framework cannot tell us whether the configuration arriving in Ireland will produce a redistributive government in time to make a difference to the underlying economic problems already in motion. It can tell us what to look for and what the dynamic is when it appears. What appeared on 24 May 2026 in Dublin Central is what it would look like if the framework's prediction were now coming to bear. Subsequent elections will tell us whether the pattern holds.

What Piketty has actually said about Ireland

The strongest single Piketty statement on Ireland on the public record is from December 2023, in the context of the EU Tax Observatory's first Global Tax Evasion Report. The Observatory is the research lab hosted at the Paris School of Economics whose director is Gabriel Zucman, Piketty's former doctoral student. The report's headline finding for Ireland was that the country's corporation tax receipts per capita had risen to roughly four and a half thousand euros, five times the figure for France or Germany, and a fivefold rise over the preceding decade.

Piketty's public response, made via social media and reported by The Irish Times on 8 December 2023, was direct. If anything the situation has deteriorated, he said. Ireland is getting an extra month of income by siphoning the tax base of others. This, he added, is probably the clearest illustration of the fact that nothing serious has been done to fight tax evasion within the European Union since 2008.

This is the most-quoted single Piketty statement about Ireland. It needs to be read alongside the earlier 2014 record, when Piketty visited Dublin to deliver the keynote address at the TASC annual conference at Croke Park on 20 June 2014. At that event, and in associated Irish media coverage, he was direct. I think Ireland has some characteristics of a tax haven, he told Irish reporters, and all European countries, or more and more European countries, are behaving like tax havens as far as corporate taxation is concerned. He specifically criticised the Local Property Tax that had recently been introduced. His argument on the property tax: it taxed gross property value rather than net wealth, and so fell hardest on mortgaged owner-occupiers whose nominal property value was high but whose actual net asset position was much lower. The correct design, he argued, would be a progressive tax on net wealth, calculated as real estate property value plus financial assets minus all forms of debt including mortgage debt.

This argument lands harder in 2026 than it did in 2014. Median residential mortgage balances in the Republic have grown substantially in the years since. The gap between the gross property value the Local Property Tax bases its calculation on and the net wealth position of the mortgaged occupier is now wider than at any point in the post-2014 period. The Local Property Tax, in its current design, transfers a fraction of the wage of any mortgaged household to the State, while leaving the unmortgaged top decile, whose property holdings dominate the upper end of the value distribution, paying a proportionately lower share of their actual net wealth. Piketty's 2014 critique of the design choice was correct then, and the choice has been allowed to continue.

What the framework predicts

Capital and Ideology contains a chapter Piketty titles Social Nativism: The Postcolonial Identitarian Trap. The argument is that the right-populist family of parties across Western democracies in the late 2010s and into the 2020s share a structural feature. They combine redistributive economic offers with anti-immigrant and anti-minority identitarian programmes. Polish PiS, the Italian Lega and Five Star Movement, French Rassemblement National, Spanish Vox, Hungarian Fidesz, the various successor configurations within the British Conservative Party and the United States Republican Party. These are not a random list of parties that happen to be on the right. They are the structurally predicted output of the Brahmin Left configuration.

The mechanism: once a multiple-elite system has emerged, with both major parties effectively coded as elite parties for different elites, the lower-education, lower-income voter has no party that addresses their distributional position. The economic-redistributive vote becomes orphaned. The available political vehicles that combine some redistributive offer with a counter-elite cultural programme are the right-populist ones, because the left-progressive parties, having captured the educated-professional vote, have moved away from the cultural priors of the orphaned working-class voter. The lower-education voter is electorally available, and the social-nativist party is the available vehicle.

What the framework predicts is not that this dynamic will only appear in countries where it has already appeared. It predicts that any country whose previous left-right coalition was held together by a class-based left-wing party will produce this dynamic if the realignment arrives. Ireland's emerging far-right is what the framework predicts in real time. Steenson's first-preference growth in Dublin Central is one data point on this. The progressive collapse of the Sinn Féin working-class vote into either soft-left progressive options or anti-establishment identitarian options is another. Naming the dynamic structurally is important, because the alternative is naming individual politicians, which both flatters them by treating them as the prime movers and obscures what is actually producing the vote share they collect.

The conventional Western-media framing of the far-right rise as a discrete cultural phenomenon, traceable to social-media radicalisation or to the personal qualities of particular politicians, obscures the structural economic dynamic underneath. It is not that the cultural phenomenon is not real. It is that the cultural phenomenon is downstream of a political-economic configuration that has been arriving in Western democracies for twenty years, and is now arriving in Ireland.

The wealth tax, and the line to Zucman

Piketty's policy proposal in Capital in the Twenty-First Century was a progressive annual wealth tax. The canonical schedule he set out in Chapter Fifteen: no tax up to one million euros of net wealth, one percent on the band between one and five million, two percent above five million. He discussed an expanded design with a starting bracket of half a percent on net worth between two hundred thousand and one million euros. He also discussed steeper variants reaching five to ten percent on net wealth above one billion. Combined with marginal income tax rates of up to 80% on incomes above the high six-figure range in dollar terms.

Piketty's own framing of the proposal was as a benchmark. He acknowledged that a globally coordinated wealth tax was, in the political conditions of 2014, beyond reach. He argued that a regional version, for instance an EU-wide design with a one and two percent schedule at one and five million euro thresholds, would touch approximately two and a half percent of the EU population and raise roughly two percent of EU GDP in revenue. The point of describing the design at the regional or global level was to specify what would be sufficient, not to claim that an immediate global treaty was within reach. Reviewers in 2014 mostly read the proposal as utopian. Some used the word. The reception coloured how the design was discussed afterward.

The proposal has since been reformulated, narrower and sharper, by Piketty's former doctoral student. Gabriel Zucman completed his PhD at the Paris School of Economics in 2013 under Piketty's supervision. His dissertation was titled Three Essays on the World Distribution of Wealth. In 2024, commissioned by the Brazilian presidency of the G20, Zucman produced a report titled A Blueprint for a Coordinated Minimum Effective Taxation Standard for Ultra-High-Net-Worth Individuals. The design is engineered to clear the political bar that Piketty's 2014 proposal was widely read as failing. A two percent minimum effective tax on wealth, applied only to individuals worth more than one hundred million euros, structured as a floor against ordinary tax already paid rather than as a new tax base. The threshold is two orders of magnitude higher than Piketty's. The mechanism is narrower. The number of affected individuals globally is approximately three thousand for the original billion-dollar version, and somewhat larger for the centimillionaire extension that several countries have begun to adopt.

The two designs are the same engine adapted to different political environments. Piketty's was an ambitious new tax base for the regional or global political conditions of the post-financial-crisis decade. Zucman's is a minimum-tax floor designed for the conditions of the mid-2020s, in which national-level legislative attempts are the only live route. The Part II piece in this pair deals with the Zucman design in detail, including the recent French legislative process, the 1975 Irish wealth tax precedent, the current state of party positions in Ireland and what a Zucman-shaped Irish minimum tax would look like in practice.

The connection between the two figures is not just academic. In September 2025, when Bernard Arnault, the principal shareholder of the LVMH group, attacked Zucman in the Sunday Times as a far-left activist and a pseudo-academic whose ideology aimed to destroy the liberal economy, Piketty defended him publicly. The two generations of economists are publicly aligned on the substantive argument and on the legitimacy of the research that supports it. The reception of the argument in the political conditions of the 2020s is the reception of one shared project.

What the test is

Donohoe's 2020 review of Capital and Ideology was a clear-eyed summary of an argument the Minister had read and understood. He concluded the review with the sentence with which this piece opens. On the test Piketty proposes, Piketty triumphs.

The test is straightforward in form. It is whether the share of national income flowing to capital and to wealth-holders, in proportion to the share flowing to wage and salary labour, can be returned, through political and tax-design choices, to something approaching the post-war ratio. The argument the test rests on is empirical: that the choice can be made, that countries have made it before and that the U-curve is reversible. The Piketty-Atkinson-Saez-Zucman body of work supplies the data, the historical comparisons and the design proposals.

The conventional Irish political response to this body of work, when it appears in public debate, is that the proposals are theoretical. They are not. The 1975 Wealth Tax Act, passed by a Fine Gael and Labour coalition government, was the Irish state's previous engagement with this design. The reasons for its abolition in 1978 are political, not technical. The next piece in this pair walks through that history and what it implies for now.

On the question of whether the political class is ignorant of the argument: the Minister for Finance reviewed the second book of the principal exponent of the argument and praised it in the national newspaper of record. The argument is not unknown to the political class. The opposition to it is choice. The 2020 review by Donohoe is the artefact that demonstrates this. The Budget 2026 he delivered in October 2025, as his final act before resigning for the World Bank a month later, is the artefact that demonstrates what the choice was.

The accountability programme companion to this piece, Every Reform, None Enacted, proposes a question to be put to every candidate at every election: which of the five named beats of the accountability programme do you oppose, and why. The substantive analogue for the rules of capital, drawing on Piketty's triptych, is the same question in different form: which of the three proposed taxes do you oppose, and why. The income tax with marginal rates rising to 80-90% on incomes one hundred times the average. The annual progressive tax on net wealth above the upper-decile threshold. The progressive inheritance tax on transfers above the equivalent threshold.

A politician who cannot name a beat they oppose is a politician who has no reason not to support the whole programme. A politician who names a beat they oppose has given you their actual position, which is almost always more informative than their manifesto. The same is true for the rules-of-capital question. A politician who cannot name one of the three Piketty taxes they oppose is a politician who has no reason not to support the whole triptych. They will not say this in public, and most will refuse to answer the question in the form Piketty's argument actually proposes. That refusal is itself the answer.

On Piketty's test, the Minister wrote in 2020, Piketty triumphs. The remaining question is what the political class is going to do about the test it has read, understood and so far refused to pass.

This piece is Part I of a pair. Part II, The Wealth Tax Ireland Already Has, covers Gabriel Zucman's minimum effective tax design, the 1975 Irish wealth tax precedent, the OECD Pillar Two contrast, the Harris Investment Savings Account counter-direction, the international cooperation architecture's collapse in 2025 and what a Zucman-shaped Irish tax would look like.

Source notes. P. Donohoe, "Weighed down by detail", The Irish Times, 16 March 2020. T. Piketty, Capital in the Twenty-First Century, Harvard University Press, 2014. T. Piketty, Capital and Ideology, Harvard University Press, 2020. A. Gethin, C. Martínez-Toledano, T. Piketty, "Brahmin Left Versus Merchant Right: Changing Political Cleavages in 21 Western Democracies, 1948-2020", Quarterly Journal of Economics, vol. 137 issue 1, February 2022, pp. 1-48. T. Piketty, G. Zucman, "Capital is Back: Wealth-Income Ratios in Rich Countries 1700-2010", Quarterly Journal of Economics, vol. 129 issue 3, 2014, pp. 1255-1310. World Inequality Database: wid.world. B. Nolan, "Long-Term Trends in Top Income Shares in Ireland", chapter in A.B. Atkinson and T. Piketty (eds), Top Incomes Over the Twentieth Century, Oxford University Press, 2007. Central Statistics Office, Household Finance and Consumption Survey 2023, published 11 June 2025. EU Tax Observatory, Global Tax Evasion Report 2024, October 2023. Oxfam Ireland, Resisting the Rule of the Rich, January 2026. The Irish Times live results coverage of the Dublin Central by-election, 24 May 2026, and Irish Times political analysis published 25 May 2026.

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